Flexi Shields
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“D” Multi-Seal is a groove-mounted gasket with a bulbous silicone elastomer for an excellent environmental seal. It comes standard with the Spira-Shield for superior shielding quality or can be ordered with any other spiral material. See below for ordering information.

Application Information

This combination EMI and environmental gasket is ideal for applications that need excellent sealing and have somewhat limited space or want to utilize a groove-mount solution (For surface mount applications, refer to the Basic Multi-Seal data sheet.)

Materials:
Spiral: Spira-Shield, Tin/lead plated beryllium copper.
Elastomer: Solid silicone rubber, 40 durometer on -0421 & -0632; 60 durometer on all other sizes. Refer to Material Specifications for more information.

Shielding Quality:
This gasket offers shielding quality from 86 dB to 165 dB. The shielding quality may vary depending on your specific application. Refer to Shielding Quality  for more complete performance data.

Compression Force:
"D" Multi-Seal gaskets come in two different resiliencies shown below. Optimal compression of the gasket is 25% of the diameter of the spiral. Since the force to compress the gasket is a function of the cube of the thickness of the beryllium copper ribbon, the compression forces shown are approximate.
Standard Force: ~33 pounds per linear inch compression.
Moderate Force: ~13 pounds per linear inch compression.
Low Force: ~5 pounds per linear inch compression.

Mounting:
This gasket is groove mounted. Refer to Groove Mounting Techniques for detailed mounting information.

Available Options

Spiral Material:
“D” Multi-Seal comes standard with a tin/lead plated Spira-Shield gasket. Other spiral materials or plating may be specified by choosing a different prefix from the following table.

1. Choose the desired gasket from the table on page 13 based on size and force.
Example: DMS-1263, moderate force, E=.375”, D=.187”

2. Substitute the prefix from the table below based on spiral material and plating.
Example: DEMT-1263, moderate force Flexi-Shield, edge tin/lead plated BC.

Spira-Shield
Quick & Ultra Quick-Shield
Enduro-Shield
Flexi-Shield
Spiral:
Tin Plated BC
St. Steel
Tin Plated BC
St. Steel
Tin Plated BC
St. Steel
Standard:
Tin/Lead or
No Plating
DSS (default)
DMS
DLS
DNI
DNM
DNL
DSISS
DSIMS
DSILS
DSINI
DSINM
DSINL
DST
DMT
DLT
DSQ
DMQ
DLQ
Tin/Lead or Edge Plating
Option (T / E)
DESS
DEMS
DELS
DTNI
DTNM
DTNL
DESISS
DESIMS
DESILS
DSITNI
DSITNM
DSITNL
DEST
DEMT
DELT
DTSQ
DTMQ
DTLQ
RoHS Tin Plating
Option (IW)
DIWSS
DIWMS
DIWLS
DIWNI
DIWNM
DIWNL
DIWSISS
DIWSIMS
DIWSILS
DIWSINI
DIWSINM
DIWSINL
DIWST
DIWMT
DIWLT
DIWSQ
DIWMQ
DIWLQ
RoHS Edge
Tin Plating
Option (EIW)
DEIWSS
DEIWMS
DEIWLS
--
DEIWSISS
DEIWSIMS
DEIWSILS
--
DEIWST
DEIWMT
DEIWLT
--

Specify a different spiral material by choosing the desired prefix from the table.

Example:
DEIWSS-1263; “D” Multi-Seal, RoHS edge plated, Spira-Shield gasket, Standard force (No cord by default)

Cord Insert:
Standard Force gaskets come without a cord. Moderate and low force gaskets come standard with PVC cord to protect the spiral from over-compression. Specify “no cord” in moderate and low force gaskets as follows:
NC: No Cord (Example: DMS-1263 NC)

Special Cord:
Special cords including solid fluorosilicone, solid silicone and thermal plastic rubber are available in some sizes. Please contact us for details.

Special Elastomer:
The standard elastomer is solid silicone. A special elastomer can be specified as shown below (available in certain sizes only).
/E: EPDM
/F: Fluorosilicone
/O: Space Qualified Silicone (non-outgassing)

Ordering Information:
"D" Multi-Seal is sold by the foot in 10 foot lengths. The pieces can be spliced together to make longer lengths for a small charge. Custom o-rings are also available. (See Custom Gaskets for more information.)

Gasket Dimensions "D" Multi-Seal Part Numbers Recommended Mounting Dimensions
Width of Gasket
E
Spiral Diameter
D
Thickness of Wall
t
Standard** Force Moderate Force Low Force Depth (L)
+.002"
-.000"
Width (G)
+.007"
-.005"
Width (W)
+.000"
-.002"
.141" .063" ± .003" N/A* DSS-0421 DMS-0421 -- .046" .187" .138"
.187" .094" ± .004" N/A* DSS-0632 DMS-0632 -- .070" .250" .180"
.250" .125" ± .004" .031" DSS-0842 DMS-0842 DLS-0842 .094" .313" .240"
.375" .187" ± .006" .047" DSS-1263 DMS-1263 DLS-1263 .140" .500" .367"
.500" .250" ± .007" .047" DSS-1684 DMS-1684 DLS-1684 .188" .625" .485"

*These sizes come with a solid elastomer.
**Standard force gaskets come without a cord.

See our Part Number Matrix for assistance with part numbers, options and product comparisons.

diagram of d multi seal diagram of d multi seal diagram of d multi seal
See Groove Mounting Techniques for mounting information. You can use either a dovetail or conventional o-ring groove.
More information is available on Dovetail Groove Cutters.